I have a spa connected to a pool, but the spa seems to be draining to pool water level everytime the pumpo shuts down. The water from the spa seems to be going back to the pool!

I have tried taking water out of the spa so the water level could be below the pool, but then the pool starter draining to the spa, until they both reached the same level!

There are no leaks, and i have tried closing and opening all the valves that control the pool, i have tried filling the spa with water, but then the spa drains to the pool until they reach the same water level, even with the pump completely shut down.

I don't know what to do, and it wasn't like this before... the water from the spa used to be much higher than the pool water level.

Anyone knows how to fix this? I don't wanna spend any money right now, so if anyone that know about pools has any ideas, i would appreciate it!

the only valves that control my pool, are: spa drain, main drain, skimmer, floor system, spa spillover!
*here's also a valve that control a jet on the side of the pool!

*sry about the misspellings!